CN109217479A - A kind of distribution terminal line loss module that the mode of connection is adaptive - Google Patents
A kind of distribution terminal line loss module that the mode of connection is adaptive Download PDFInfo
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Abstract
The invention belongs to distribution network terminal technical fields, more particularly to a kind of distribution terminal line loss module that the mode of connection is adaptive, including multiple independent measurement loops, MCU control module, IO driving circuit, voltage channel selection circuit, MCU data isolation high speed transmitting line, RS485 telecommunication circuit and RS232 telecommunication circuit, each measurement loop includes voltage sampling circuit, current sampling circuit, signal conditioning circuit and metering chip, the output end of voltage sampling circuit and current sampling circuit is connect after passing through signal conditioning circuit with the input terminal of metering chip, the output end of metering chip is connected by SPI communication and the input terminal of MCU control module；MCU control module carries out correspondence with foreign country by RS485 telecommunication circuit and RS232 telecommunication circuit.The route that the present invention realizes distribution line loss module is adaptive, can be widely applied to field of power distribution.
Description
Technical field
The invention belongs to distribution network terminal technical fields, and in particular to a kind of distribution terminal line loss mould that the mode of connection is adaptive
Block.
Background technique
Distribution transformer, cable, switchgear, reactive-load compensation equipment loss and each connection in high voltage distribution network route
The factors such as impedance, the electromagnetic radiation of point can produce electricl energy loss, increasingly tight with controller switching equipment, increasing for equipment of protection
Weight efficiently carries out the calculating of Line Loss of Distribution Network System, can optimize electric network composition, dispatching running way and decreasing loss analysis, improve economic effect
Benefit etc..Line Loss of Distribution Network System module major function is to provide a large amount of accurate, real time datas for analysis to power department and go through
History data effectively manage local power distribution network with assist power department.
The distribution line loss module of domestic production at present is required to carry out voltage rating calibration according to power supply mode difference, that is, goes out
The quantitative model for needing to demarcate distribution line loss module when factory is three-phase three-wire system or three-phase four-wire system, in the life of the equipment such as distribution terminal
During production, need to determine the mounting means at scene in advance, this is caused very to distribution manufacturer and site installation test
Big trouble, once the mode of connection information at scene provides inaccuracy or design scheme change, distribution terminal equipment need scene
The line loss module for replacing not collinear system, brings very big trouble to site operation and debugging, not only influences the duration, but also produce two
Task amount.
Summary of the invention
For the actual demand for adapting to field of electrical equipment, the present invention overcomes the shortcomings of the prior art, to be solved
Technical problem is a kind of distribution terminal line loss module that the mode of connection is adaptive.
In order to solve the above-mentioned technical problem, a kind of the technical solution adopted by the present invention are as follows: distribution that the mode of connection is adaptive
Terminal line loss module, including multiple independent measurement loops, MCU control module, IO driving circuit, correspondence with foreign country circuit, each
The measurement loop includes voltage sampling circuit, current sampling circuit, voltage channel selection circuit, signal conditioning circuit and metering
Chip, the output end of the voltage sampling circuit is after voltage channel selection circuit, signal conditioning circuit, with the metering chip
Input terminal connection；The output end of the current sampling circuit passes through the input terminal after signal conditioning circuit with the metering chip
The output end of connection, the metering chip is connect by SPI communication with the input terminal of the MCU control module；The IO driving
The control terminal of circuit is connect with the output end of the MCU control module, the control letter for being exported according to the MCU control module
Number CS is selected to control the piece of each metering chip, be also used to the control signal exported according to the MCU control module, described in control
Voltage channel selection circuit selects voltage channel, and the MCU control module is externally led to by correspondence with foreign country circuit
Letter.
The voltage sampling circuit includes 6 current mode voltage transformers, and the current sampling circuit includes that 3 electric currents are mutual
Sensor, the output signal of the voltage transformer are distinguished after voltage channel selection circuit with the output signal of current transformer
The metering chip, the circuit and capacitance that the RC low-pass filter circuit is 1k by resistance value are output to after RC low-pass filter circuit
It is formed for the capacitor of 0.033uF, cutoff frequency 4.8kHz.
The model ATT7022E of the metering chip, 26 pin SEL of the metering chip and the MCU control module
Output end connection, be provided with capacitor filter, the master chip of the IO driving circuit at 12 pins of the metering chip
Model MC74LCX245DT.
The voltage channel selection circuit includes analog switch chip ADG1634BRUZ, the analog switch chip
The control terminal of ADG1634BRUZ is connect by the IO driving circuit with the MCU control module.
The master chip of the MCU control module is STM32F417, and the master chip STM32F417 is using outside passive 8MHz
It sets and provides work clock for MCU after crystal oscillator frequency multiplication；Circuit is supervised as reset using S-80126CLMC-JIZ chip,
Using S-80146CLMC-JIZ as low-voltage testing circuit, plug-in IIC communication device 3, two of them EEPROM, distinguish
For storing metering relevant parameter and electric energy data, another is RTC clock chip, and the master chip STM32F417 is also outer
It has hung for storing SPI communication FALSH.
The correspondence with foreign country circuit includes MCU data isolation transmitting line, MCU data isolation reception circuit, MCU data control
Circuit, RS485 chip, RS232 chip, bus protection circuit and bus selection circuit processed.
The MCU control module is used for the input signal according to metering chip, reads point of each phase voltage and metering chip
Phase power, and according to the split-phase power and phase voltage of reading, determine the mode of connection of line loss module, and according to the mode of connection, it is right
Metering chip carries out mode adjusting setting.
The MCU control module reads the split-phase function of each phase voltage and metering chip according to the input signal of metering chip
Rate, and according to the split-phase power and phase voltage of reading, determine the mode of connection of line loss module method particularly includes:
When the phase power of a certain phase is 0, the voltage sample of the phase is 0, and another two input voltage range 100V ±
When 20%, determine that the mode of connection is 2PT/2CT；
When three split-phases have power, and three-phase voltage determines that the mode of connection is 3PT/3CT in 57.7V ± 20%；
When each phase voltage value is within 57.7V ± 20%, but a certain phase current is zero, determine that the mode of connection is 3PT, and
And it is per second to current channel progress primary current mode decision, clearly instruct or determine that current sample mode is until receiving
Only；
After the mode of connection determines, MCU control module carries out adjusting setting to metering chip, sets three for its quantitative model
The operation of three line of phase or three-phase and four-line operational mode.
Compared with the prior art, the invention has the following beneficial effects: adaptive the present invention provides a kind of mode of connection
By the way that the independent measurement loop of multichannel is arranged the independent assortment of multiple metering may be implemented, and right in distribution terminal line loss module
Measuring accuracy is without influence；Without dispatch from the factory voltage rating line system calibration, may be implemented distribution line full voltage range (100V or
57.7V), the accuracy of total current range (0.3A-1.2A or 1.5A-6A) metering；Software identification is carried in the line loss module, it can
Route to realize distribution line loss module is adaptive.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the distribution terminal line loss module that the mode of connection is adaptive proposed by the present invention；
Fig. 2 is the circuit connection diagram of measurement loop in the embodiment of the present invention；
Fig. 3 is the connection schematic diagram of voltage channel selection circuit in the embodiment of the present invention；
Fig. 4 is the circuit connection diagram of IO driving circuit in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of MCU control module in the embodiment of the present invention；
Fig. 6 is the structural block diagram of power module in the embodiment of the present invention；
Fig. 7 is the structural block diagram of correspondence with foreign country circuit in the embodiment of the present invention.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with specific embodiments and the drawings, to this hair
Bright technical solution is clearly and completely described, it is clear that and described embodiment is a part of the embodiments of the present invention, and
The embodiment being not all of；Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work
Under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the invention provides a kind of distribution terminal line loss modules that the mode of connection is adaptive, including
8 independent measurement loops, MCU control module, IO driving circuit, correspondence with foreign country circuit, each measurement loop include electricity
Press sample circuit, current sampling circuit, voltage channel selection circuit, signal conditioning circuit and metering chip, the voltage sample
The output end of circuit is connect after voltage channel selection circuit, signal conditioning circuit with the input terminal of the metering chip；It is described
The output end of current sampling circuit is connect after passing through signal conditioning circuit with the input terminal of the metering chip, the metering chip
Output end connect with the input terminal of the MCU control module by SPI communication；The control terminal of the IO driving circuit with it is described
The output end of MCU control module connects, and control signal for being exported according to the MCU control module controls each metering core
The piece of piece selects CS, is also used to the control signal exported according to the MCU control module, controls the voltage channel selection circuit choosing
The voltage channel selected, the MCU control module carry out correspondence with foreign country by correspondence with foreign country circuit.
Specifically, in 8 road independent measure circuits, metering chip is using Hi-Trend Technology (Shanghai) Co., Ltd.
ATT7022E multifunction high-precision three-phase electric energy the special metering IC, is internally integrated 7 channel independence 16bitADC, and sampling rate reaches
Can 28.8kHz, data exchange is carried out by SPI between chip and MCU, traffic rate can reach 10Mbps.The chip is suitable for
Phase three-wire three and three-phase and four-line application.Original three phase metering chip needs hardware to demarcate phase three-wire three and three-phase and four-line,
This chip is by the way that 26 pin SEL of chip, outside access high level is, it can be achieved that software changes mode at any time.I.e.: outside
When portion pin SEL=1, operating mode differentiation is carried out by register ModSel control bit.ModSel=0 is three-phase four-wire system；
ModSel=1 is three-phase three-wire system.At 12 pin AVCC metering analog power supplys of each metering units, pass through 1 big capacitance electricity
Solution capacitor 1 low-capacitance capacitor in parallel is filtered, and guarantees the operation is stable of analog circuit, 5 pin amplifier benchmark electricity of chip
Source REFCAP does same decoupling processing.
The specific following characteristics of measurement loop of the invention:
(1) as shown in Fig. 2, in each measurement loop, voltage sample passes through 6 current mode voltage transformers (PT1-PT6)
Secondary side current is converted into voltage signal, specified input 2mA, rated output 2mA, 0~1000V of the range of linearity, and the linearity≤
0.2%, sampling resistor is all made of 51 Europe precision low-temps drift resistance, and resistance is floated by High Precision Low Temperature in channel input current part
After sampling, the sampling pin of metering chip is input to finally by RC low-pass filter；Current signal passes through three Current Mutual Inductances
Device (CT1-CT3) acquires A, B, C three-phase current respectively, and input rated current 5A, the rated output 2.5mA of current transformer become
Than 2000:1, phase difference≤20 ', 0~20A of the range of linearity, the linearity 0.2%, precision -0.2%≤f≤0.2%.Channel is defeated
Enter current segment, resistance (RA1, RA2) sample conversion is floated into voltage signal using RC low-pass filter by High Precision Low Temperature
It is input to the sampling pin of metering chip afterwards；
(2) filtering processing of metering chip analog signal power supply and amplifier reference power supply:
Metering chip voltage VD7022 passes through 10 Europe resistance, is input to AVCC, REFCAP after CA13 and CA14 filter shape
Pin is filtered with CA15 and CA16 capacitor, guarantees the stabilization of reference voltage, and metering chip working power VDD and VCC is same
The design of REFCAP pin introduces after input power filtering processing.
(3) selection of the resistance and capacitor of RC low-pass filtering: the selection of RC low-pass filtering is the important of measurement loop precision
Guarantee section, this programme chooses 1k and 0.033uF capacitor forms, such as resistance RA3 in Fig. 2 and capacitor CA1, cutoff frequency 4.8kHz
Left and right.
(4) level state of chip phase line base pin selection；It is the design focal point of entire circuit herein, it is necessary to assure metering is every
The SEL pin high level of road chip inputs；SLE pin is directly connected with metering chip power supply.
That is, voltage sampling circuit includes that 6 current mode voltages are mutual in each measurement loop of the embodiment of the present invention
Sensor, current sampling circuit includes 3 current transformers, after the voltage transformer first passes through voltage channel selection circuit, and
The output signal of current transformer is output to the metering chip, the RC low-pass filtering electricity after RC low-pass filter circuit respectively
It routes the circuit that resistance value is 1k and the capacitor that capacitance is 0.033uF forms, cutoff frequency 4.8kHz.The 26 of the metering chip
Pin SEL is connect with the output end of the MCU control module, and capacitor filtering electricity is provided at 12 pins of the metering chip
Road.
As shown in figure 3, the voltage channel selection circuit includes analog switch chip ADG1634BRUZ, the simulation is opened
The control terminal for closing chip ADG1634BRUZ is connect by the IO driving circuit with the MCU control module.Consider scene access
Amount of acquisition channels is more, the independent metering method in 8 tunnels of ad hoc meter, but on-the-spot meeting the case where there are 2 road input voltages, for convenience of scene
Setting, ad hoc meter voltage circuit increase analog switch ADG1634BRUZ to realize the distribution of voltage in 8 road measurement loops.Simulation
The mainly internal resistance of the offer of consideration -5V regulated power supply and switch when switch designs, because this programme line loss module requires sampling precision
It is higher, it is therefore desirable to choose the extremely low device of switch internal resistance to guarantee the accuracy of metering.
Further, as shown in figure 4, the master chip model MC74LCX245DT of the IO driving circuit.MCU controls mould
Block and 8 tunnel metering chips use spi bus data communication, and communication process selects CS by the piece of each metering chip of control to determine
Communicated with which metering chip, for guarantee data communication quality, therefore using master chip be MC74LCX245DT IO drive
Circuit is driven, to realize MCU control module selection communication pin CS, in addition, there are one chips in IO driving circuit
MC74LCX245DT is used for the control signal exported according to MCU control module, controls the analog switch core in each measurement loop
Piece, select in voltage collection circuit in two-way voltage wherein all the way.
Further, as shown in figure 5, being the structural schematic diagram of MCU control module in the present embodiment, the MCU controls mould
The master chip of block is STM32F417, this chip is ARM32-bit Cortex-M4 kernel, built-in floating point arithmetic element (FPU).
Operating voltage range 1.8V to 3.6V, the flat rate 168MHz of maximum functional.The master chip STM32F417 is using outside passive 8MHz
It sets and provides work clock for MCU after crystal oscillator frequency multiplication；Circuit is supervised as reset using S-80126CLMC-JIZ chip,
It is 2.6V that chip, which protects voltage, exports low level lower than 2.2V chip OUT pin, and maintain 50mS.Using S-
80146CLMC-JIZ is as low-voltage testing circuit, when detecting 5V voltage lower than 4.6V, exports low electricity by chip OUT pin
It is flat, and 200mS is maintained, for handling power down relevant treatment.Plug-in IIC communication device 3 is two 512KB respectively
EEPROM and RTC chip.1 EEPROM measures relevant parameter for storing 8 tunnels, including calibration data etc.；Another 1 EEPROM is used
In all kinds of electric energy datas of storage, the electric energy data of backup.RTC uses the integrated clock chip of Epson, clock accuracy root
It is compensated automatically according to external temperature, is not necessarily to manual intervention, is provided simultaneously with leap year automatic conversion.The master chip STM32F417 is also outer
It has hung for storing SPI communication FALSH.
In addition, line loss module field connection mode has following two: voltage link mode has: 3PT (VN wiring) connection and
Two kinds of connections of 2PT (VV wiring)；The electric current mode of connection has: 3CT exports electric current and 2CT exports two kinds of electric current connection；As scene is
Phase three-wire three, it is A/N/C that nominal voltage, which inputs A/B/C external cabling access line loss module,.
I:3PT (3CT) mode
Under this mode, input phase voltage is 57.7V；
II:2PT (2CT)
Under this mode, inputting line voltage 100V；
In the embodiment of the present invention, the built-in identification software of the MCU control module, this is used for the input according to metering chip
Signal reads the split-phase power of each phase voltage and metering chip, and according to the split-phase power and phase voltage of reading, determines line loss mould
The mode of connection of block, and according to the mode of connection, mode adjusting setting is carried out to metering chip.Its specific decision procedure is as follows: MCU
Control module powers on default metering chip three-phase four-wire system mode, reads each phase voltage first, and then MCU control module reads meter
Measure chip split-phase power:
(1) 0, and A, C phase input voltage range 100V ± 20% are sampled for 0, B phase voltage such as B phase power, be determined as
2PT (2CT) mode.
(2) if instead split-phase A, B, C phase has power, and A, B, C phase voltage are determined as in 57.7V ± 20%
3PT (3CT) mode, it is subsequent that no longer mode is corrected.
(3) as there is inputting each phase voltage value within 57.7V ± 20% but in the case that B phase current is zero, mode is pressed
Determine mode operation according to voltage, main website (field adjustable software) not determine mode situation under, MCU it is per second to current channel into
Row primary current mode decision, until clearly instructing until receiving or determine current sample mode.
After final clear operating status, adjusting setting is carried out to metering chip mode by MCU, is adjusted to phase three-wire three
Operation or three-phase and four-line operational mode.
The present invention program combines live distribution terminal debugging software, determines the working condition of line loss module, can avoid completely
Because workload caused by field connection mode is different, greatly improves the in-site installation and debugging cycle of distribution terminal equipment, subtracts
Distribution terminal in-site installation failure rate is lacked.
In addition, as shown in fig. 6, external 48V voltage is filtered through lightning protection over-voltage and is protected in the power module of the embodiment of the present invention
Circuit input turns to turn 3.3V low pressure difference linearity LDO power supply through the first 5V after 5V isolated power supply module is converted to 5V voltage through 48V
It is converted into 3.3V voltage to power to MCU control module, turning 3.3V low pressure difference linearity LDO power conversion through the 2nd 5V is 3.3V voltage
Metering chip power supply is given, turning 3.3V low pressure difference linearity LDO power conversion through the 3rd 5V is 3.3V voltage to other IC module for power supply,
Turning 5V isolated power supply through 5V simultaneously is that the isolated amplifier in circuit is powered；Turn 3.3V low pressure difference linearity LDO power supply through the first 5V
Conversion output 3.3V voltage is also used to power to RTC chip, and charges to super capacitor, and super capacitor discharges after power down, gives
MCU control module and real-time clock power supply.
In the embodiment of the present invention, it is provided with high speed modular RS485 and RS232 communication interface；Traffic rate standard speed
4800bit/s, 9600bit/s, 19200bit/s, 38400bit/s are optional；Interface communication follows DL/T 634.5101-2002
Agreement.As shown in fig. 7, be correspondence with foreign country circuit structural block diagram, correspondence with foreign country circuit include MCU data isolation transmitting line,
MCU data isolation receives circuit, MCU data control circuit, RS485 chip, RS232 chip, bus protection circuit and total line selection
Select circuit.
(1) RS485 telecommunication circuit
The RS485 communication interface of high-speed isolated optocoupler, traffic rate reach as high as 38400bps.Circuit design mainly considers
The design of the characteristic of optocoupler, R30, R31, R32, R33 and R34 is extremely important, it is ensured that guarantees communication quality at high temperature.TVS's
It is designed to protection differential mode surge voltage, voltage clamping avoids circuit excessive pressure damages in 6.8V.
(2) RS232 telecommunication circuit
RS232 carries out RS485 communication and RS232 communication selection by wire jumper UART and COM, and this programme is only supported a kind of logical
Letter mode, RS232 use the TVS of model SMBJ22CA, inhibit bus common mode interference.
The embodiment of the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Example, within the knowledge of a person skilled in the art, can also make without departing from the purpose of the present invention
Various change out.
Claims (8)
1. a kind of distribution terminal line loss module that the mode of connection is adaptive, which is characterized in that including multiple independent measurement loops,
MCU control module, IO driving circuit, correspondence with foreign country circuit, each measurement loop include voltage sampling circuit, current sample
The output end of circuit, voltage channel selection circuit, signal conditioning circuit and metering chip, the voltage sampling circuit is logical through voltage
After road selection circuit, signal conditioning circuit, it is connect with the input terminal of the metering chip；The output end of the current sampling circuit
By connecting after signal conditioning circuit with the input terminal of the metering chip, the output end of the metering chip passes through SPI communication
It is connect with the input terminal of the MCU control module；The control terminal of the IO driving circuit and the output end of the MCU control module
Connection, the control signal for being exported according to the MCU control module select CS to control the piece of each metering chip, are also used to root
According to the control signal that the MCU control module exports, controls the voltage channel selection circuit and voltage channel is selected, institute
It states MCU control module and correspondence with foreign country is carried out by correspondence with foreign country circuit.
2. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 1, which is characterized in that described
Voltage sampling circuit includes 6 current mode voltage transformers, and the current sampling circuit includes 3 current transformers, the electricity
Press mutual inductor output signal is after voltage channel selection circuit and the output signal of current transformer is respectively through RC low-pass filtering
The metering chip is output to after circuit, the circuit that the RC low-pass filter circuit is 1k by resistance value and capacitance are 0.033uF's
Capacitor composition, cutoff frequency 4.8kHz.
3. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 2, which is characterized in that described
The model ATT7022E of metering chip, 26 pin SEL of the metering chip and the output end of the MCU control module connect
It connects, capacitor filter, the master chip model of the IO driving circuit is provided at 12 pins of the metering chip
MC74LCX245DT。
4. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 3, which is characterized in that described
Voltage channel selection circuit includes analog switch chip ADG1634BRUZ, the control of the analog switch chip ADG1634BRUZ
End is connect by the IO driving circuit with the MCU control module.
5. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 4, which is characterized in that described
The master chip of MCU control module is STM32F417, and the master chip STM32F417 uses the external crystal oscillator of passive 8MHz
Work clock is provided after frequency multiplication for MCU；Using S-80126CLMC-JIZ chip as supervision circuit is resetted, using S-
80146CLMC-JIZ is respectively used to deposit as low-voltage testing circuit, plug-in IIC communication device 3, two of them EEPROM
Storage metering relevant parameter and electric energy data, another is RTC clock chip, and the master chip STM32F417 is also plug-in to be used
In storage SPI communication FALSH.
6. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 1, which is characterized in that described
Correspondence with foreign country circuit includes MCU data isolation transmitting line, MCU data isolation reception circuit, MCU data control circuit, RS485
Chip, RS232 chip, bus protection circuit and bus selection circuit.
7. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 1, which is characterized in that described
MCU control module is used for according to the input signal of metering chip, reads the split-phase power of each phase voltage and metering chip, and according to
The split-phase power and phase voltage of reading determine the mode of connection of line loss module, and according to the mode of connection, carry out mould to metering chip
Formula adjusting setting.
8. a kind of adaptive distribution terminal line loss module of mode of connection according to claim 7, which is characterized in that described
MCU control module reads the split-phase power of each phase voltage and metering chip, and according to reading according to the input signal of metering chip
Split-phase power and phase voltage, determine the mode of connection of line loss module method particularly includes:
When the phase power of a certain phase is 0, the voltage sample of the phase is 0, and when another two input voltage range 100V ± 20%,
Determine that the mode of connection is 2PT/2CT；
When three split-phases have power, and three-phase voltage determines that the mode of connection is 3PT/3CT in 57.7V ± 20%；
When each phase voltage value is within 57.7V ± 20%, but a certain phase current is zero, determine that the mode of connection is 3PT, and every
Second carries out primary current mode decision to current channel, until clearly instructing until receiving or determine current sample mode；
After the mode of connection determines, MCU control module carries out adjusting setting to metering chip, sets three-phase three for its quantitative model
Line operation or three-phase and four-line operational mode.
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| CN201811408907.6A CN109217479B (en) | 2018-11-23 | 2018-11-23 | Distribution terminal line loss module with self-adaptive wiring mode |
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| CN201811408907.6A CN109217479B (en) | 2018-11-23 | 2018-11-23 | Distribution terminal line loss module with self-adaptive wiring mode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247479A (en) * | 2019-07-16 | 2019-09-17 | 威胜集团有限公司 | Line feed terminals line loss device and its data processing method |
| CN110554260A (en) * | 2019-08-13 | 2019-12-10 | 威胜信息技术股份有限公司 | double-circuit voltage switching line loss measuring system and control method and device |
| CN111122964A (en) * | 2019-12-20 | 2020-05-08 | 北京五力泰科技有限公司 | Electric energy metering method and system |
| CN113687141A (en) * | 2021-08-17 | 2021-11-23 | 威胜集团有限公司 | Metering circuit, multichannel metering circuit and metering equipment |
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| CN113687141A (en) * | 2021-08-17 | 2021-11-23 | 威胜集团有限公司 | Metering circuit, multichannel metering circuit and metering equipment |
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